Результаты (
английский) 3:
[копия]Скопировано!
1. despite wide recognition of the need for catchment scale management to ensure the integrity of river ecosystems, the science and policy basis for joint management of land and water remains poorly understood. an my second case study of a river basin in south-eastern michigan is presented.2. the river raisin drains an area of 2776 km2, of which some 70% is agricultural land. the upper basin consists of till and outwash, and both topography and land use / cover are diverse. the lower basin consists of fine textured lake deposits, is of low relief, and land use is primarily agricultural.3. the river raisin basin development was a region of the oak - savannah and wetlands. it was deforested, drained and converted to farmland during the mid 19th century. human population reached a plateau at about 1880, and then as a second period of growth after 1950, mainly in small urban areas. more recently, the amount of agricultural land has declined and forested land has increased, in accordance with common rules of procedure and a general decline in farming activity.
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